Nuclear fuel pellet having enhanced thermal conductivity and method for manufacturing the same

A technology of nuclear fuel and thermal conductivity, which is applied in the direction of reactor fuel elements, reactor fuel materials, nuclear engineering, etc., can solve the problem that the improvement effect of large thermal conductivity cannot be expected, and achieve the effect of increasing thermal conductivity, improving performance and safety

Pending Publication Date: 2019-08-23
KOREA ATOMIC ENERGY RES INST
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The content of different kinds of materials that can be mixed in the sintered body is very limited due to economic problems such as the reduction in the length of the nuclear fuel cycle, but in the case of metal particles having a simple shape, if the content is small, there is a problem compared with the content Limitations where a large thermal conductivity improvement effect cannot be expected

Method used

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  • Nuclear fuel pellet having enhanced thermal conductivity and method for manufacturing the same
  • Nuclear fuel pellet having enhanced thermal conductivity and method for manufacturing the same
  • Nuclear fuel pellet having enhanced thermal conductivity and method for manufacturing the same

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[0030] Preparation method of nuclear fuel sintered body with improved thermal conductivity

[0031] The present invention provides a method for preparing a nuclear fuel sintered body with improved thermal conductivity, which is characterized in that it includes: step (a), preparing a mixture including oxide nuclear fuel powder and plate-shaped heat-conducting metal powder; and step (b), so that The above-mentioned plate-shaped heat-conducting metal powder in the above-mentioned mixture is molded so as to have orientation in the horizontal direction, and then heat-treated to prepare a sintered body.

[0032] The term "oxide nuclear fuel powder" used in this specification is formed from an oxide nuclear fuel precursor, and refers to a state before the granulation process described below, that is, a distinct concept. Specifically, the above-mentioned oxide nuclear fuel powder refers to a powder having an average particle diameter of 0.1 μm to 50 μm. UO 2 The powder is made as...

Embodiment 1

[0074] As oxide nuclear fuel powder, UO with an average particle size of about 0.3 μm was prepared 2 powder. On the other hand, a spherical Mo powder having an average particle diameter of about 0.3 μm was subjected to a grinding process to prepare a plate-like Mo powder. At this time, the prepared platy Mo powder had an average width of about 5 μm and a thickness of about 0.3 μm.

[0075] Afterwards, for prepared UO 2 powder, 5% by volume of the prepared platy Mo powder was mixed to prepare a mixture.

[0076] Then, perform uniaxial press molding under a pressure of about 300 MPa, so that the platy Mo powder has orientation in the horizontal direction in the prepared mixture, and then, in a hydrogen atmosphere, heat treatment at a temperature of about 1700 ° C for 4 hours, To prepare nuclear fuel sintered bodies.

Embodiment 2

[0078] A sintered body was prepared in the same manner as in Example 1, except that the spherical Mo powder with an average particle size of about 5 μm was ground to prepare a plate-like Mo powder with an average width of about 15 μm and a thickness of about 0.4 μm.

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Abstract

The invention relates to a nuclear fuel sintered body having enhanced thermal conductivity and a method for manufacturing the same. The method comprises the following steps: (a) preparing a mixture comprising oxide nuclear fuel powder and plate-shaped heat-conducting metal powder; and (b) producing a sintered body by molding the plate-shaped heat conducting metal powder in the mixture so that theplate-shaped heat conducting metal powder has an orientation in the horizontal direction and then heat-treating the molded powder.

Description

technical field [0001] The invention relates to a nuclear fuel sintered body with improved thermal conductivity and a preparation method thereof. Background technique [0002] Nuclear power generation uses the heat generated by the fission of atomic nuclei to pack tens to hundreds of sintered bodies made of nuclear fuel materials into cladding tubes, seal both ends to make fuel rods, and then bundle dozens to hundreds of them fuel rods to create an aggregate. These fuel rod aggregates are incorporated into a nuclear reactor and used, and the heat generated in the sintered body is transferred through the nuclear fuel sintered body to cooling water flowing around the fuel rods through the cladding tube. [0003] On the other hand, as nuclear fuel often used in nuclear power generation, cylindrical sintered materials manufactured by molding and sintering materials such as oxides such as uranium (U), plutonium (Pu) or thorium (Th) alone or in combination are used body. At thi...

Claims

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Application Information

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IPC IPC(8): G21C21/02G21C3/62
CPCG21C21/02G21C3/623G21C3/045Y02E30/30
Inventor 金东奭金东主吴将洙金健湜金钟宪梁宰豪
Owner KOREA ATOMIC ENERGY RES INST
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